Here are some websites on the various styles.
http://www.mla.org/style
http://www.chicagomanualofstyle.org/home.html
http://www.press.uchicago.edu/books/turabian/turabian_citationguide.html
http://www.sbl-site.org/publications/publishingwithsbl.aspx (EDIT: Look at the Student Supplement. It should have all you need for citation styles)
which one you use is based on what field you are in. SBL and Turabian (which is a variant of the Chicago Manual) are the most used for Biblical/Religious studies.
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